Perhaps you should try some spelling variations:
tang tai » hang tai, dung tai, sang tao
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thue va » thuyet va, thuc vat, thuat va
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
y nang » ky nang, ly nang, v nang
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang xa hoi. hieu va cam ((thue va) or (thuc va)) tang tai ((cua tre) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu va cam ((thue va) OR (thuc va)) tang tai ((cua tre) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu va cam ((thue va) or (thuc va)) tang tai ((cua tre) or (va thiet))*.