Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tru nang » tra nang, tri nang, thi nang
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa
cua tu » cua tuc, cua su, cua te
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 ((tru nang) OR (truc nano)) ma hoi. hieu ve 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 ((tru nang) OR (truc nano)) ma hoi. hieu ve 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 ((tru nang) OR (truc nano)) ma hoi. hieu ve cac xuc van hanh dai ((cua tu) or (cua cu))".
• Adding a wildcard symbol may retrieve word variants: toc sach ((tru nang) OR (truc nano)) ma hoi. hieu ve cac xuc van hanh dai ((cua tu) or (cua cu))*.