Perhaps you should try some spelling variations:
trang vat » trang va, tang vat, trang mat
trang vai » trang va, trang tai, trang giai
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
cong ban » cong bang, cong san, cong tan
ban toan » bai toan, ban than, van toan
toan cau » toan cao, toan ban, toan tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (doi chi)) xanh - hanh ((trang vat) OR (trang vai)) dung cong ban toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chi)) xanh - hanh ((trang vat) OR (trang vai)) dung cong ban toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chi)) xanh - hanh ((trang vat) OR (trang vai)) dung cong ban toan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chi)) xanh - hanh ((trang vat) OR (trang vai)) dung cong ban toan cau*.