Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
rac tren » ran tren, tac tren, sach tren
va thanh » gia thanh, ban thanh, va tinh
cac tren » ca tren, cau tren, tac tren
hieu van » hieu va, thien van, lieu va
te sach » toc sach
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
cam luc » cam xuc, cau luc
luc va » duc va, tuc va, loc va

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) or (thu hoach)) ky nang xa hoi. hieu van cam luc va thanh vai ((cac tren) OR (rac tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu hoach)) ky nang xa hoi. hieu van cam luc va thanh vai ((cac tren) OR (rac tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu hoach)) ky nang xa hoi. hieu van cam luc va thanh vai ((cac tren) OR (rac tren))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu hoach)) ky nang xa hoi. hieu van cam luc va thanh vai ((cac tren) OR (rac tren))*.