Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dan hanh » dang hanh, dan khanh, dan thanh
hanh tai » thanh tai, hang tai, han tai
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
tai cua » thai cua, tai cuc, tri cua
xu cac » xu bac, eu cac, su cac
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((xu cac) OR (tu cac)) ky lang ha hoi. ((hieu qua) or (lieu va)) co hoc dan hanh tai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((xu cac) OR (tu cac)) ky lang ha hoi. ((hieu qua) OR (lieu va)) co hoc dan hanh tai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((xu cac) OR (tu cac)) ky lang ha hoi. ((hieu qua) or (lieu va)) co hoc dan hanh tai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((xu cac) OR (tu cac)) ky lang ha hoi. ((hieu qua) or (lieu va)) co hoc dan hanh tai cua triet*.