Perhaps you should try some spelling variations:
cam hoc » cao hoc, am hoc, cam hoa
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
ve cac » va cac, vien cac
ve cau » ke cau, va cau, le cau
te san » te ban, tu san, ta san
ke san » ke dan
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te san) or (ke san)) ky tang xa hoi. hieu va cam hoc va hanh ((ve cau) OR (ve cac)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te san) OR (ke san)) ky tang xa hoi. hieu va cam hoc va hanh ((ve cau) OR (ve cac)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te san) or (ke san)) ky tang xa hoi. hieu va cam hoc va hanh ((ve cau) OR (ve cac)) tren".
• Adding a wildcard symbol may retrieve word variants: ((te san) or (ke san)) ky tang xa hoi. hieu va cam hoc va hanh ((ve cau) OR (ve cac)) tren*.