Perhaps you should try some spelling variations:
thay nuoc » tham nuoc, tray nuoc, thoat nuoc
hieu van » hieu va, thien van, lieu va
van thay » van tham, van than, van thac
hanh lai » hanh lam, hanh tai, thanh lap
te sach » toc sach
ty nang » ty xang, ly nang, ty nong
ty hang » ly hang, ty xang, thi hang
cao hoi » cau hoi, co hoi, cao hoc
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
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) OR (ky nang))) or (ty hang)) cao hoi. hieu van thay nuoc va hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((((ty nang) OR (ky nang))) OR (ty hang)) cao hoi. hieu van thay nuoc va hanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((((ty nang) OR (ky nang))) or (ty hang)) cao hoi. hieu van thay nuoc va hanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((((ty nang) OR (ky nang))) or (ty hang)) cao hoi. hieu van thay nuoc va hanh lai cua tre*.