Perhaps you should try some spelling variations:
lam duoc » nam duoc, luat duoc, lam thuoc
hieu van » hieu va, thien van, lieu va
ban danh » ban doanh, ban hanh, ban dan
dau tren » dau tien, dat tren, dau tieng
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
lam xuc » cam xuc
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet

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 ky nang x ho. hieu van ((lam xuc) or (lam duoc)) ban danh vi ((cua tre) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x ho. hieu van ((lam xuc) OR (lam duoc)) ban danh vi ((cua tre) OR (dau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x ho. hieu van ((lam xuc) or (lam duoc)) ban danh vi ((cua tre) or (dau tren))*.