Perhaps you should try some spelling variations:
hoc viet » hoc hien
thuc van » thuc vat, thuc dan, thuc va
sach ky » sac ky, sach y, sach ty
tuc van » truc van, tuc va, duc van
ve cham » va cham, ve chat, vu cham
su sach » so sach, vu sach
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
ve cam » ve cac, va cam, ve cai
ma hoi » mai hoi, xa hoi, ma hoa
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: su sach ky tang ma hoi. hieu ((ve cam) or (ve cham)) ((tuc van) or (thuc van)) hanh vi hoc viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang ma hoi. hieu ((ve cam) OR (ve cham)) ((tuc van) OR (thuc van)) hanh vi hoc viet.
• Adding a wildcard symbol may retrieve word variants: su sach ky tang ma hoi. hieu ((ve cam) or (ve cham)) ((tuc van) or (thuc van)) hanh vi hoc viet*.