Perhaps you should try some spelling variations:
tang thai » trang thai, tang tai, tang thi
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
cam thue » cam thu, lam thue, nam thue
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
thue va » thuc va, thuyet va, thuc vat
va tang » va trang, van tang, ha tang
cua tre » cua te, cuu tre, dua tren
va cam » va cham, va cac, va cao

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 y ((nang xa) OR (lang xa)) hoi. lieu va cam thue va tang thai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang xa) OR (lang xa)) hoi. lieu va cam thue va tang thai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang xa) OR (lang xa)) hoi. lieu va cam thue va tang thai ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang xa) OR (lang xa)) hoi. lieu va cam thue va tang thai ((cua tre) or (cua triet))*.