Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
xuc van » duc van, luc van, vuc van
nang ma » tang ma, sang ma, nang cao
sach va » sach xa, sach ha, sach dao
ma hoi » mai hoi, xa hoi, ma hoa
sach v » sach y, sach 2, sach vay
ve cac » vien cac
cua tu » cua tuc, cua su, cua cu

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