Perhaps you should try some spelling variations:
khien bang » phien ban
khien dong » nhiet dong, dien dong, bien dong
manh trung » manh tung, thanh trung, manh hung
nhu phuong » thu phuong, nhung phuong, thi phuong
phuong dan » phuong danh, phuong doan, huong dan
trung vap » trung cap, trung va, trung van
khan cap » khan ap, than cap, khoan cam
hanh cac » hang cac, hanh cat, nhanh cay
vap nhu » tap nhu, vap nhung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((khien bang) OR (khien dong)) - manh trung vap nhu phuong dan ((khan cap) or (hanh cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((khien bang) OR (khien dong)) - manh trung vap nhu phuong dan ((khan cap) OR (hanh cac)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((khien bang) OR (khien dong)) - manh trung vap nhu phuong dan ((khan cap) or (hanh cac))".
• Adding a wildcard symbol may retrieve word variants: hoc ((khien bang) OR (khien dong)) - manh trung vap nhu phuong dan ((khan cap) or (hanh cac))*.