Perhaps you should try some spelling variations:
trinh thi » trinh tai, dinh thi, trinh tu
hieu van » hieu va, thien van, lieu va
cau nuoc » cap nuoc, cac nuoc, dau nuoc
trinh ve » trinh he, trinh va, trinh vi
sach ty » sach tu, sach thu, xach tay
van cau » van dau, van hau, van chat
ang xa » lang xa, mang xa, dang xay
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sach y)) ang xa hoi. hieu van cau nuoc va ((trinh ve) or (trinh thi)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) ang xa hoi. hieu van cau nuoc va ((trinh ve) OR (trinh thi)) cua tu.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) ang xa hoi. hieu van cau nuoc va ((trinh ve) or (trinh thi)) cua tu*.