Perhaps you should try some spelling variations:
hoc chinh » hoan chinh, hoc sinh
trung vap » trung cap, trung va, trung lap
trung van » truong van, trong van, trung va
hang cong » dang cong, hang nong, bang cong
hoc kinh » hoc sinh, luoc kinh
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chinh) OR (hoc kinh)) sach - thanh ((trung vap) or (trung van)) hang cong tac than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chinh) OR (hoc kinh)) sach - thanh ((trung vap) OR (trung van)) hang cong tac than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chinh) OR (hoc kinh)) sach - thanh ((trung vap) or (trung van)) hang cong tac than cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc chinh) OR (hoc kinh)) sach - thanh ((trung vap) or (trung van)) hang cong tac than cau*.