Perhaps you should try some spelling variations:
sach cam » sach cap, mach cam, sach tham
nam thuc » nam thuoc, am thuc, nam thu
va hanh » van hanh, va thanh, va danh
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ca thu » cac thu, cam thu, ca tru
vi su » va su, ve su, oi su
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach cam nang xa hoi. hieu va ((ca thu) or (nam thuc)) va hanh ((vi su) or (ki su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach cam nang xa hoi. hieu va ((ca thu) OR (nam thuc)) va hanh ((vi su) OR (ki su)) triet.
• Adding a wildcard symbol may retrieve word variants: vu sach cam nang xa hoi. hieu va ((ca thu) or (nam thuc)) va hanh ((vi su) or (ki su)) triet*.