Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
hanh sinh » hanh tinh, hanh dinh, hinh sinh
hang tong » hang thong, han tong, hang nong
manh toan » thanh toan, anh tuan, tinh toan
sinh va » sinh vat, tinh va, dinh van
va hang » van hang, va nang, va lang
van tan » van tuan, van ban, van tai

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 xanh - hanh sinh va hang tong ((manh toan) or (van tan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh sinh va hang tong ((manh toan) OR (van tan)) ban*.