Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
hanh vai » hanh vi, hanh va, hanh tai
sach thi » sach tai, sach thieu, sach tham
cac thuc » cach thuc, cac thu, can thuc
thuc va » thuc vat, thuc dan, thuc day
vai cua » dai cua, hai cua, lai cua
nang ma » tang ma, nang cao, mang may
va hanh » van hanh, va thanh, va danh
sang ma » tang ma, sang tao, mang may
hieu va » lieu va, hieu qua
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: toc ((sach thi) or (sach thu)) ((nang ma) OR (sang ma)) hoi. hieu va cac thuc va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach thi) OR (sach thu)) ((nang ma) OR (sang ma)) hoi. hieu va cac thuc va hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach thi) or (sach thu)) ((nang ma) OR (sang ma)) hoi. hieu va cac thuc va hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: toc ((sach thi) or (sach thu)) ((nang ma) OR (sang ma)) hoi. hieu va cac thuc va hanh vai cua te*.