Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
kho tang » cao tang
hanh tai » thanh tai, hang tai, han tai
sai kho » dai kho, tai khoa, dai khoa
tang xa » trang xa, tang ma, lang xa
qua cam » qua cham, qua cac, qua ca
duc van » duc va, duc manh, duc phan
cua tre » cua te, cuu tre, dua tren
su sai » su tai, su hai, su dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai kho tang xa hoi. hieu qua cam ((duc van) or (duc tan)) hanh tai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai kho tang xa hoi. hieu qua cam ((duc van) OR (duc tan)) hanh tai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai kho tang xa hoi. hieu qua cam ((duc van) or (duc tan)) hanh tai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sai kho tang xa hoi. hieu qua cam ((duc van) or (duc tan)) hanh tai ((cua tre) OR (cua triet))*.