Perhaps you should try some spelling variations:
sang thang » cang thang, sang than, lang thang
quang tran » quang tuan, quang trung, quang thanh
thang kiem » thong kiem, thanh liem, trang kien
hieu soat » hieu suat, hieu hoat, hieu luat
nang sang » nang song, nong san
tran van » luan van
van hieu » cao hieu
kiem thu » kieu thu, kien thuc, diem thuc
ki nang » ky nang
tinh » trinh, dinh, minh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh quang tran van hieu soat ) or ( ki nang sang thang kiem thu ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quang tran van hieu soat ) OR ( ki nang sang thang kiem thu )).
• Adding a wildcard symbol may retrieve word variants: (( tinh quang tran van hieu soat ) or ( ki nang sang thang kiem thu ))*.