Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tang tai » hang tai, dung tai, sang tao
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thue va » thuc va, thuc vat, thuat va
cua tre » cua te, cuu tre, dua tren
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: te sach y nang xa hoi. hieu va cam ((thue va) OR (thuyet va)) tang tai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang xa hoi. hieu va cam ((thue va) OR (thuyet va)) tang tai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang xa hoi. hieu va cam ((thue va) OR (thuyet va)) tang tai ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang xa hoi. hieu va cam ((thue va) OR (thuyet va)) tang tai ((cua tre) or (cua triet))*.