Perhaps you should try some spelling variations:
trinh vat » trinh van, trinh luat, sinh vat
cua viet » ca viet, hoa viet, cua vat
va trinh » van trinh, va tinh, lap trinh
vu khac » vu kham, vu khanh, bui khac
khac ty » khac thi
ve cham » va cham, ve chat, vu cham
ty hang » ly hang, ty xang, thi hang
co viet » so viet, o viet, hoc viet
xuc va » duc va, tuc va, luc va
ve cam » ve cac, va cam, ve cai
va hoi » xa hoi, va hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu khac ty hang va hoi. hieu ((ve cam) or (ve cham)) xuc va trinh vat ((cua viet) or (co viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khac ty hang va hoi. hieu ((ve cam) OR (ve cham)) xuc va trinh vat ((cua viet) OR (co viet)).
• Adding a wildcard symbol may retrieve word variants: vu khac ty hang va hoi. hieu ((ve cam) or (ve cham)) xuc va trinh vat ((cua viet) or (co viet))*.