Perhaps you should try some spelling variations:
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tac, cac nuoc
ky dang » ky nang, ky danh
dang ma » dang mau, dang mam, dang mat
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu van
dan vai » dan va, dan tai, dan vat
va dan » ca dan, va dao, va dau
cac tu » cac thu, cach tu, cac du
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky dang ma hoi. ((hieu ve) or (hieu va)) ((cac tuc) OR (cac tu)) va dan vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky dang ma hoi. ((hieu ve) OR (hieu va)) ((cac tuc) OR (cac tu)) va dan vai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky dang ma hoi. ((hieu ve) or (hieu va)) ((cac tuc) OR (cac tu)) va dan vai cua te*".