Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
va caua » va chua
hieu su » hieu sau, tieu su, hieu so
hieu vu » hieu va, hieu ve, dieu vu
ty nang » ky nang, ty xang, ty hang
va cau » van cau, va cac, va dau
x hoi » xa hoi, o hoi, x ho

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 x hoi. ((hieu vu) OR (hieu su)) cham duc va thanh ((va caua) or (va cau)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. ((hieu vu) OR (hieu su)) cham duc va thanh ((va caua) OR (va cau)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. ((hieu vu) OR (hieu su)) cham duc va thanh ((va caua) or (va cau)) te".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. ((hieu vu) OR (hieu su)) cham duc va thanh ((va caua) or (va cau)) te*.