Perhaps you should try some spelling variations:
phuong luong » thuong luong, phuong duong, phuong dung
manh trung » manh tung, thanh trung, manh hung
chieu sang » chieu sach, chieu xanh, hieu lang
hieu manh » chieu xanh, hieu nganh, dieu hanh
va phuong » va thuong, cac phuong
luong van » luong va, duong van, luong vat
trung va » truong va, trang va, trung ha
van toan » van tuan, van tan, van thanh
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: hoc ((hieu manh) or (chieu sang)) - manh trung va phuong luong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chieu sang)) - manh trung va phuong luong van toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chieu sang)) - manh trung va phuong luong van toan cao*.