Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
manh anh » minh anh, anh anh, thanh anh
duc manh » suc manh, duc anh, duc minh
cau cham » ca cham, cau chan, cau chap
cau pham » cau phan, cau phap, chau phan
va triet » va thiet, va trien, ve triet
ty nang » ky nang, ty hang, ly nang
anh vu » hanh vu, anh tu, anh va
vu va » vu van, tu va, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ty nang) OR (ty xang)) xa hoi. hieu ((cau pham) or (cau cham)) duc manh anh vu va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty nang) OR (ty xang)) xa hoi. hieu ((cau pham) OR (cau cham)) duc manh anh vu va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty nang) OR (ty xang)) xa hoi. hieu ((cau pham) or (cau cham)) duc manh anh vu va triet".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty nang) OR (ty xang)) xa hoi. hieu ((cau pham) or (cau cham)) duc manh anh vu va triet*.