Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
duc manh » suc manh, duc anh, duc minh
thu nang » thi nang, thu hang, thu bang
nang mai » nang ma, nang tai, lang mai
hieu van » thien van, lieu va, hieu ve
hanh vai » hanh vi, hanh va, hanh tai
sach thu » sach thue, sach thieu, sach tham
te sach » toc sach
cua tuc » cua duc, cua thuoc, luat tuc
hai duc » hoai duc, mai duc, ha duc
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
cua tu » cua su, cua cu, cua te

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thu nang mai hoi. ((hieu van) or (hieu va)) hai duc manh hanh vai ((cua tu) OR (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang mai hoi. ((hieu van) OR (hieu va)) hai duc manh hanh vai ((cua tu) OR (cua tuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang mai hoi. ((hieu van) or (hieu va)) hai duc manh hanh vai ((cua tu) OR (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: te sach thu nang mai hoi. ((hieu van) or (hieu va)) hai duc manh hanh vai ((cua tu) OR (cua tuc))*.