Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
khien bang » phien ban, khien dong
phuong dan » phuong danh, phuong doan, huong dan
hoc khien » hoc hien, hoc nghien, hoc thieu
trung vap » trung cap, trung van, trung lap
trung va » truong va, trang va, trung ha
khan cap » khan ap, than cap, khoan cam
hanh cac » hang cac, hanh cat, nhanh cay

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