Perhaps you should try some spelling variations:
cuong dung » tuong duong, ung dung, thong dung
quang dung » quang trung, ung dung
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
trong dan » trong dang, trong san, trong tan
hoc hieu » hoc thieu, hoc hien, doc hieu
hieu cua » hieu qua, dieu cua, bieu cua
toan cao » toan tap
toan ban » van ban

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 cua - hanh tinh ((quang dung) or (cuong dung)) trong dan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cua - hanh tinh ((quang dung) OR (cuong dung)) trong dan ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu cua - hanh tinh ((quang dung) or (cuong dung)) trong dan ((toan cao) or (toan ban))*.