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

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

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