Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
va phan » van phan, va phat, va phap
thai va » thai van
va han » van han, va hanh, va hang

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

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