Perhaps you should try some spelling variations:
cam tuc » cam xuc, cam tu, nam thuc
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
hieu ve » hieu van
hieu va » lieu va, hieu qua
so dac » so dan
vi hoc » va hoc
xa dan » ca dan, xa dai, va dan
dac ky » cac ky, dan ky, sac ky
ma hoi » mai hoi, xa hoi, ma hoa
hien » bien, vien, tien

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

• Performing a fuzzy search may retrieve terms with similar spellings: so dac ky tang ma hoi. ((hieu ve) or (hieu va)) cam tuc xa dan ((vi hoc) or (li hoc)) hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so dac ky tang ma hoi. ((hieu ve) OR (hieu va)) cam tuc xa dan ((vi hoc) OR (li hoc)) hien.
• Adding a wildcard symbol may retrieve word variants: so dac ky tang ma hoi. ((hieu ve) or (hieu va)) cam tuc xa dan ((vi hoc) or (li hoc)) hien*.