Perhaps you should try some spelling variations:
tang van » dang van, hoang van, trong van
cam truc » cau truc, nam truc, lam truoc
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
tang ma » mang may
doan vi » doan va, don vi, doan thi
sac kho » suc khoe, cac khoi, dac khoa
dan vi » don vi, dan va, gan vi
so sac » so sach, so dac
ve cam » ve cham, ve cac, va cam
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 sac kho ((tang ma) or (tang van)) hoi. hieu ve cam truc va ((dan vi) OR (doan vi)) hoc hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac kho ((tang ma) OR (tang van)) hoi. hieu ve cam truc va ((dan vi) OR (doan vi)) hoc hien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac kho ((tang ma) or (tang van)) hoi. hieu ve cam truc va ((dan vi) OR (doan vi)) hoc hien".
• Adding a wildcard symbol may retrieve word variants: so sac kho ((tang ma) or (tang van)) hoi. hieu ve cam truc va ((dan vi) OR (doan vi)) hoc hien*.