Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
chat duc » chat xuc, chat doc, chet duoc
xang cho » sang cho, hang cho, tang cho
te cach » ve cach, te sach, te cac
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc manh
hieu ve » hieu van
cho hoc » co hoc, khoa hoc
tu xang » ty xang, tu lang, tu quang
tu cach » tu cac
lai cua » dai cua, hai cua, lai chau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te cach) OR (tu cach)) tu xang cho hoc. ((hieu ve) or (hieu va)) chat duc van hanh lai cua cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te cach) OR (tu cach)) tu xang cho hoc. ((hieu ve) OR (hieu va)) chat duc van hanh lai cua cac*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te cach) OR (tu cach)) tu xang cho hoc. ((hieu ve) or (hieu va)) chat duc van hanh lai cua cac*".