Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cham hoi » cham voi, cham h'roi, pham hoai
tinh dai » trinh dai, tinh da, tinh hai
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
cua tre » cuu tre, cua triet, dua tren
y tang » ky tang, 6 tang, 7 tang
nam lo » nam bo, nam so, nam co
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y tang ma hoa. hieu ve ((cham hoi) or (nam lo)) may tinh dai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y tang ma hoa. hieu ve ((cham hoi) OR (nam lo)) may tinh dai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: thuat sach y tang ma hoa. hieu ve ((cham hoi) or (nam lo)) may tinh dai ((cua tre) or (cua te))*.