Perhaps you should try some spelling variations:
nguong dan » huong dan
hoc tieng » hoc hien
hoc tien » hoc hien, hoc vien, hoc tren
anh dung » anh dong, anh huong, sach dung
cong san » cong tac
phan cac » nhan cach, phan dau, phan lap
va nang » van nang, da nang, cam nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc tien) OR (hoc tieng)) anh - anh dung va nang ((nguong dan) or (cong san)) phan cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc tien) OR (hoc tieng)) anh - anh dung va nang ((nguong dan) OR (cong san)) phan cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc tien) OR (hoc tieng)) anh - anh dung va nang ((nguong dan) or (cong san)) phan cac".
• Adding a wildcard symbol may retrieve word variants: ((hoc tien) OR (hoc tieng)) anh - anh dung va nang ((nguong dan) or (cong san)) phan cac*.