Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tham luc » than luc, tham nuoc, tham thuc
hanh tai » thanh tai, hang tai, han tai
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren
te bai » te bao, te tai, te ban
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te bai ((ky lang) OR (ky nang)) xa hoi. hieu va tham luc va hanh tai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te bai ((ky lang) OR (ky nang)) xa hoi. hieu va tham luc va hanh tai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te bai ((ky lang) OR (ky nang)) xa hoi. hieu va tham luc va hanh tai ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te bai ((ky lang) OR (ky nang)) xa hoi. hieu va tham luc va hanh tai ((cua tre) or (cua triet))*.