Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
cang hang » cang thang, hang hang, nang hang
va trong » va truong, va thong, va tuong
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
tran cau » tran chau, toan cau, ran cau
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: ((hoc thieu) or (doi chi)) xanh - cang hang va trong ((cong tan) or (cong tac)) tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (doi chi)) xanh - cang hang va trong ((cong tan) OR (cong tac)) tran cau.
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (doi chi)) xanh - cang hang va trong ((cong tan) or (cong tac)) tran cau*.