Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thanh ve » hanh ve, thanh va, thanh vien
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
lam tuc » lam thuoc, lam truoc, luat tuc
cua tre » cua te, cuu tre, cua triet
van lam » van nam
ma hoi » mai hoi, xa hoi, ma hoa
v nang » va nang, vu nang, van nang
y nang » ky nang, ly nang, may nang
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((y nang) or (v nang)) ma hoi. hieu van lam tuc va thanh ve ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y nang) OR (v nang)) ma hoi. hieu van lam tuc va thanh ve ((cua tre) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ((y nang) or (v nang)) ma hoi. hieu van lam tuc va thanh ve ((cua tre) or (cua viet))*.