Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
tu nang » tru nang, tu nong, tu nano
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu van
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
cua tu » cua tuc, cua su, cua te
ma hoi » mai hoi, xa hoi, ma hoa
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tu nang ma hoi. ((hieu ve) OR (hieu va)) cac xuc van hanh dai ((cua tu) or (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu nang ma hoi. ((hieu ve) OR (hieu va)) cac xuc van hanh dai ((cua tu) OR (cua cu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu nang ma hoi. ((hieu ve) OR (hieu va)) cac xuc van hanh dai ((cua tu) or (cua cu))".
• Adding a wildcard symbol may retrieve word variants: toc sach tu nang ma hoi. ((hieu ve) OR (hieu va)) cac xuc van hanh dai ((cua tu) or (cua cu))*.