Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hai chi » thai chi, tai chi, hai thi
hai chu » hai chau, hoi chu, hai phu
hai cuu » hai cua, hai cuc, thai cua
va manh » van manh, va danh, va hanh
cao duc » dao duc, cao suc, giao duc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
va cao » va cac, va co, va dao

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 ty nang xa hoi. hieu va cao duc va manh ((((hai cuu) OR (hai chu))) or (hai chi)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu va cao duc va manh ((((hai cuu) OR (hai chu))) OR (hai chi)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu va cao duc va manh ((((hai cuu) OR (hai chu))) or (hai chi)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu va cao duc va manh ((((hai cuu) OR (hai chu))) or (hai chi)) tre*.