Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
nang mai » nang ma, nang tai, lang mai
vu sach » vu bach, vu khach
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cac luc » cau luc, coc luc, cac nuoc
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang
su sach » so sach
cuu tre » cau tren, cau treo
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (su sach)) ly nang mai hoi. hieu ve cac luc va hanh dai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ly nang mai hoi. hieu ve cac luc va hanh dai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ly nang mai hoi. hieu ve cac luc va hanh dai ((cua tre) or (cuu tre))*.