Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
ban thai » ban than, ban thi, ban tai
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
thai va » thai van
v nang » va nang, vu nang, van nang
xuc va » duc va, tuc va, luc va
va ban » van ban, va bai, va bao

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)) v nang xa hoi. hieu van cam xuc va ban thai va (thiet or thieu)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) v nang xa hoi. hieu van cam xuc va ban thai va (thiet OR thieu).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) v nang xa hoi. hieu van cam xuc va ban thai va (thiet or thieu)".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) v nang xa hoi. hieu van cam xuc va ban thai va (thiet or thieu)*.