Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
manh tung » manh hung, thanh tung
ho chieu » theo chieu, doi chieu, mot chieu
cong ban » cong bang, cong san, cong dan
cong tan » cong tac, cong san, cong thanh
phan cau » phan dau, phan cac, phan tu
tung va » trung va, tuong va, dung va
va dung » van dung, va duong, vat dung

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 (hoc thieu)) xanh - manh tung va dung ((cong ban) or (cong tan)) phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - manh tung va dung ((cong ban) OR (cong tan)) phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (hoc thieu)) xanh - manh tung va dung ((cong ban) or (cong tan)) phan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (hoc thieu)) xanh - manh tung va dung ((cong ban) or (cong tan)) phan cau*.