Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cham luc » cham soc, nhan luc, chat lua
cham cuu » cap cuu, chat cua
van hanh » van thanh, ban hanh, van anh
ve triet » va trien, su triet
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
v nang » va nang, vu nang, van nang
vi ve » va ve, gi ve, ve ve

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) or (hoc sach)) v nang xa hoi. hieu qua ((cham luc) OR (cham cuu)) van hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (hoc sach)) v nang xa hoi. hieu qua ((cham luc) OR (cham cuu)) van hanh vi ve triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (hoc sach)) v nang xa hoi. hieu qua ((cham luc) OR (cham cuu)) van hanh vi ve triet*".