Perhaps you should try some spelling variations:
tham nuoc » thay nuoc, thoat nuoc, nha nuoc
van tham » van thanh, van tuan, van chat
hieu van » hieu va, thien van, lieu va
hanh lam » thanh lap, hanh kem, hanh va
hanh lai » hanh tai, thanh lap, thanh loi
sach ty » sach y, sach thu, xach tay
cao hoi » cau hoi, co hoi, cao hoc
sach tu » sach thu, cach tu, sach uu
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ty) or (sach tu)) nang cao hoi. hieu van tham nuoc va ((hanh lai) OR (hanh lam)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach tu)) nang cao hoi. hieu van tham nuoc va ((hanh lai) OR (hanh lam)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach tu)) nang cao hoi. hieu van tham nuoc va ((hanh lai) OR (hanh lam)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach tu)) nang cao hoi. hieu van tham nuoc va ((hanh lai) OR (hanh lam)) cua tre*.