Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
hoang xa » hoang ha, hoang va, hoang xuan
hieu van » hieu va, thien van, lieu va
sanh thi » anh thi, oanh thi, nhanh thi
so sanh » do sanh
hang xa » hang va, hang ca, lang xa
van cam » van nam, van lam, van cau
dao su » dao suu, dan su, da su

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh thi ((hang xa) or (hoang xa)) hoi. hieu van cam thuc dan hanh ((dao su) or (cao su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh thi ((hang xa) OR (hoang xa)) hoi. hieu van cam thuc dan hanh ((dao su) OR (cao su)) triet.
• Adding a wildcard symbol may retrieve word variants: so sanh thi ((hang xa) or (hoang xa)) hoi. hieu van cam thuc dan hanh ((dao su) or (cao su)) triet*.