Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
xuc van » duc van, luc van, vuc van
hai hai » khai hai, dai hai, tai hai
hai hau » hai chau, dai hau, lai chau
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
hieu va » lieu va, hieu qua
ly nang » ky nang, ly hang, ly vang
va cam » va cham, va cac, va cao
x hoi » o hoi, x ho, 5 hoi

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 ly nang ((x hoi) OR (xa hoi)). hieu va cam xuc van hanh ((hai hau) or (hai hai)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang ((x hoi) OR (xa hoi)). hieu va cam xuc van hanh ((hai hau) OR (hai hai)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang ((x hoi) OR (xa hoi)). hieu va cam xuc van hanh ((hai hau) or (hai hai)) treo".
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang ((x hoi) OR (xa hoi)). hieu va cam xuc van hanh ((hai hau) or (hai hai)) treo*.