Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
cac tren » cau tren, rac tren, tac tren
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
ca tren » cau tren, cu tren, la tren
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 hoach)) ky nang o hoi. hieu van cam duc va thanh vai ((cac tren) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky nang o hoi. hieu van cam duc va thanh vai ((cac tren) OR (ca tren)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky nang o hoi. hieu van cam duc va thanh vai ((cac tren) or (ca tren))*.