Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
nang van » dang van, tang van, lang van
va trinh » van trinh, va tinh, lap trinh
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
van hoi » van hoa, van hoc, van hoe
hieu ve » hieu va, hieu van
coc tuc » coc luc, hoc thuc, doc thuc
van cuu » van cau, van chu, van cu
cuu tre » cua tre, cau tren, cau treo
ve coc » ve cuoc, ve cac, ve co
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (co sach)) ky nang van hoi. hieu ve coc tuc va trinh van cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky nang van hoi. hieu ve coc tuc va trinh van cuu tre*.