Perhaps you should try some spelling variations:
hoc thiet » hoc thieu, hoc thuyet, hoc hien
sach ky » sac ky, sach y, sach ty
danh va » doanh va, hanh va, anh va
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
ma hoi » mai hoi, xa hoi, ma hoa
va hoc » van hoc

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

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