Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
thu nang » thi nang, thu hang, thu bang
hanh lai » hanh lam, hanh tai, thanh lap
ban hanh » ban hang
duc ban » duc tan, duc van, dua ban
cua tuc » cua duc, cua tu, cua thuoc
te sach » toc sach
hac duc » hoc duc, ha duc, thach duc
van hac » van hoc, van ha, van hai
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
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) or (thuoc sach)) thu nang ma hoi. hieu van hac duc ban hanh lai ((cua tuc) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuoc sach)) thu nang ma hoi. hieu van hac duc ban hanh lai ((cua tuc) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuoc sach)) thu nang ma hoi. hieu van hac duc ban hanh lai ((cua tuc) or (cua su))*.