Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, tu cach
va hanh » van hanh, va thanh, va danh
cho hoc » co hoc, khoa hoc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
te sach » toc sach
vu huu » vu huy, tu huu
va chi » van chi, va che, va cai
ve cho » ve co, ve che, de cho

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 (te sach)) ty nang xa hoi. hieu ve cho hoc va hanh ((vu huu) or (va chi)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ty nang xa hoi. hieu ve cho hoc va hanh ((vu huu) OR (va chi)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ty nang xa hoi. hieu ve cho hoc va hanh ((vu huu) or (va chi)) tre*".