Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
vanh dai » van dai, vanh tai, lanh dao
lang van » dang van, tang van, hoang van
hieu va » lieu va, hieu qua
cua tre » cuu tre, cua triet, dua tren
va vanh » va van, va danh, va hanh
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
van hoi » van hoa, van hoc, van hoe
ky lang » ky nang, ky dang, ky tang
cua te » cua tu
va am » va lam, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thu sach)) ky lang van hoi. hieu va am thuc va vanh dai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky lang van hoi. hieu va am thuc va vanh dai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky lang van hoi. hieu va am thuc va vanh dai ((cua tre) or (cua te))*.