Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
hieu cach » hieu cac, chieu sach, hieu ca
tung tuan » hung tuan, quang tuan, trang tuan
hung cong » nhung cong, hung cuong, phung cong
cong lang » cong vang, cong luong, cong quang
lang phan » nang phan, lang thang, lang phong
hieu cua » hieu qua, dieu cua, bieu cua
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu cach) or (hieu cua)) - thanh ((tung tuan) or (trung tuan)) hung cong lang phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu cach) OR (hieu cua)) - thanh ((tung tuan) OR (trung tuan)) hung cong lang phan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cach) or (hieu cua)) - thanh ((tung tuan) or (trung tuan)) hung cong lang phan cau*.