Perhaps you should try some spelling variations:
phuong doan » phuong loan, phuong hoang, huong dan
hanh trung » thanh trung, hanh trang, manh trung
phuong dan » phuong danh, huong dan, phuong lan
doi chieu » doi chi, ho chieu, mot chieu
trung vap » trung cap, trung va, trung van
vap nhung » va nhung, ve nhung, voi nhung
doc hieu » toc thieu, hoc thieu, hoc hien
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (doc hieu)) sach - hanh trung vap nhung ((phuong dan) OR (phuong doan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - hanh trung vap nhung ((phuong dan) OR (phuong doan)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doc hieu)) sach - hanh trung vap nhung ((phuong dan) OR (phuong doan)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doc hieu)) sach - hanh trung vap nhung ((phuong dan) OR (phuong doan)) toan cau*.