Perhaps you should try some spelling variations:
thien van » thi van
cau tren » cu tren, dau tren, ca tren
va thanh » gia thanh, ban thanh, le thanh
thu sach » tu sach, thuat sach, thuoc sach
vai cau » va cau, van cau, vai cac
va tinh » may tinh
so sach » so sanh, bo sach, co sach
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
cam tuc » cam xuc, cam tu, nam thuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (thu sach)) ky nang xa hoi. thien van cam tuc ((va thanh) OR (va tinh)) vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (thu sach)) ky nang xa hoi. thien van cam tuc ((va thanh) OR (va tinh)) vai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (thu sach)) ky nang xa hoi. thien van cam tuc ((va thanh) OR (va tinh)) vai cau tren".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (thu sach)) ky nang xa hoi. thien van cam tuc ((va thanh) OR (va tinh)) vai cau tren*.