Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
sang mai » sang ma, sang tai, lang mai
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
hieu ve » hieu va, hieu van
sach tu » cach tu, sach ty, sach uu
mai hoi » mai khoi, dai hoi, lai hoi
ve cac » va cac, vien cac
cua tu » cua tuc, cua cu, cua te
cua su » qua su

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 tu) or (sach thu)) sang mai hoi. hieu ve cac xuc van hanh dai ((cua tu) OR (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tu) OR (sach thu)) sang mai hoi. hieu ve cac xuc van hanh dai ((cua tu) OR (cua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach tu) or (sach thu)) sang mai hoi. hieu ve cac xuc van hanh dai ((cua tu) OR (cua su))".
• Adding a wildcard symbol may retrieve word variants: te ((sach tu) or (sach thu)) sang mai hoi. hieu ve cac xuc van hanh dai ((cua tu) OR (cua su))*.