Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
nam thuc » nam thuoc, am thuc, nam thu
thuc ban » thuoc ban, thuc dan, thu ban
ban hanh » ban hang
hanh lai » hanh lam, hanh tai, thanh lap
dau tren » dau tien, dat tren, dau tieng
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tru nang ma hoi. hieu ve nam thuc ban hanh lai ((cua triet) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tru nang ma hoi. hieu ve nam thuc ban hanh lai ((cua triet) OR (dau tren)).
• Adding a wildcard symbol may retrieve word variants: so sach tru nang ma hoi. hieu ve nam thuc ban hanh lai ((cua triet) or (dau tren))*.