Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
cau tren » cu tren, dau tren, ca tren
va thanh » gia thanh, ban thanh, va tinh
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau treo
tu sach » su sach, te sach, tu cach
cau duc » cao duc, cau luc, chu duc
cao hoi » cau hoi, co hoi, cao hoc
van cau » van dau, van hau, van chat

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) or (thu sach)) ky nang cao hoi. hieu van cau duc va thanh dai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang cao hoi. hieu van cau duc va thanh dai ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang cao hoi. hieu van cau duc va thanh dai ((cuu tre) or (cau tren))*.