Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
lam duoc » nam duoc, luat duoc, lam thuoc
thu sach » thuat sach, thuoc sach, thu hoach
hanh tai » thanh tai, hang tai, han tai
tang mai » tang ma, tang tai, lang mai
hanh va » hang va, hanh vi
duoc va » nuoc va, duc va, duoc ma
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, kho tang
va lam » van lam, va lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ky tang mai hoi. hieu va lam duoc va ((hanh tai) or (hanh va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky tang mai hoi. hieu va lam duoc va ((hanh tai) OR (hanh va)) cau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky tang mai hoi. hieu va lam duoc va ((hanh tai) or (hanh va)) cau tren*.