Perhaps you should try some spelling variations:
tray nuoc » thay nuoc, tran quoc, tham nuoc
hoc sach » hoc sinh, hoc cac, hoc anh
hanh lai » hanh lam, hanh tai, thanh lap
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
va tray » va trac, va tra, ba tray
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ty nang cao hoi. hieu va tray nuoc va hanh lai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty nang cao hoi. hieu va tray nuoc va hanh lai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: hoc sach ty nang cao hoi. hieu va tray nuoc va hanh lai ((cua tre) or (cuu tre))*.