Perhaps you should try some spelling variations:
tham nuoc » thay nuoc, thoat nuoc, nha nuoc
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
hanh tai » thanh tai, hang tai, hinh tai
han tai » hang tai, nhan tai, van tai
te sach » toc sach
sach ty » sach y, sach tu, sach thu
cao hoi » cau hoi, co hoi, cao hoc
ty nang » ky nang, ty xang, ty hang
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 nang cao hoi. ((hieu van) or (thien van)) tham nuoc va ((hanh tai) OR (han tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang cao hoi. ((hieu van) OR (thien van)) tham nuoc va ((hanh tai) OR (han tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang cao hoi. ((hieu van) or (thien van)) tham nuoc va ((hanh tai) OR (han tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang cao hoi. ((hieu van) or (thien van)) tham nuoc va ((hanh tai) OR (han tai)) cua tre*.