Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
lam xuc » cam xuc, lam duoc
van lam » van nam
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, mang may
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 ma) or (nang cao)) hoi. hieu van lam xuc ((ban hang) OR (ngan hang)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (nang cao)) hoi. hieu van lam xuc ((ban hang) OR (ngan hang)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang ma) or (nang cao)) hoi. hieu van lam xuc ((ban hang) OR (ngan hang)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ma) or (nang cao)) hoi. hieu van lam xuc ((ban hang) OR (ngan hang)) vi cua tre*.