Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
thu sach » tu sach, thuat sach, thuoc sach
tang mam » dang mam, mang mam, tang dam
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
cam duc » cam xuc, cao duc, pham duc
tang ma » mang may, tang van
cuc tre » duc tre, cua tre, cuu tre

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 ky ((tang ma) or (tang mam)) hoi. ((hieu va) OR (lieu va)) cam duc va thanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((tang ma) OR (tang mam)) hoi. ((hieu va) OR (lieu va)) cam duc va thanh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((tang ma) or (tang mam)) hoi. ((hieu va) OR (lieu va)) cam duc va thanh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((tang ma) or (tang mam)) hoi. ((hieu va) OR (lieu va)) cam duc va thanh tai cuc tre*.