Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
va trien » va truyen, va thiet, va tuyen
ky tang » ky nang, ky dang, kho tang
qua cao » qua cac, qua ca, qua cai
cao hoc » co hoc, cho hoc, chat hoc
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky
ha hoi » hoa hoi, ha noi, ha hoa
va hoi » va hoc, va hoa
vai va » mai va, dai va, hai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky tang ((((ha hoi) or (va hoi))) or (xa hoi)). hieu qua cao hoc va thanh vai va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky tang ((((ha hoi) OR (va hoi))) OR (xa hoi)). hieu qua cao hoc va thanh vai va trien.
• Adding a wildcard symbol may retrieve word variants: su xac ky tang ((((ha hoi) or (va hoi))) or (xa hoi)). hieu qua cao hoc va thanh vai va trien*.