Perhaps you should try some spelling variations:
hoc viet » hoc hien
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
so sac » so sach, so dac
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi hoc » li hoc, va hoc

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

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