Perhaps you should try some spelling variations:
tang thai » trang thai, tang tai, tang thi
thu sach » tu sach, thuat sach, thuoc sach
cam thue » cam thu, lam thue, nam thue
su triet » su viet, su tien, ve triet
nang xa » nang x, lang xa, nang ma
thue va » thuc va, thuyet va, thuc vat
va tang » va trang, van tang, ha tang
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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 hoi. lieu va cam thue va tang thai ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang xa hoi. lieu va cam thue va tang thai ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. lieu va cam thue va tang thai ((cua tre) or (su triet))*.