Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
duc manh » suc manh, duc anh, duc minh
thi hang » thi hanh, thi nang, thi hong
te sach » toc sach
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
hieu ve » hieu van
cho hoc » co hoc, khoa hoc
ty nang » ky nang, ty xang, ty hang
cua cau » cua cac, cua chu, cua cay
vi cua » vai cua, di cua

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 ((ty nang) or (thi hang)) cho hoc. ((hieu ve) OR (hieu va)) cac duc manh hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (thi hang)) cho hoc. ((hieu ve) OR (hieu va)) cac duc manh hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) or (thi hang)) cho hoc. ((hieu ve) OR (hieu va)) cac duc manh hanh vi cua cau*".