Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam thuc » am thuc, nam thuc, cam thu
sach thu » sach thue, sach thieu, sach tham
tang tai » hang tai, dung tai, sang tao
cua tre » cua te, cuu tre, dua tren
va tang » va trang, van tang, ha tang
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, xach tay
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
hang x » nang x, hoang xa, chang xu
x hoi » xa hoi, o hoi, x ho

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 ty) or (sach thu)) hang x hoi. hieu va cam thuc va tang tai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach thu)) hang x hoi. hieu va cam thuc va tang tai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach thu)) hang x hoi. hieu va cam thuc va tang tai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach thu)) hang x hoi. hieu va cam thuc va tang tai ((cua tre) OR (cua triet))*.