Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh van » thanh van, khanh van, hanh san
cham duc » pham duc, cham soc, pham duy
hanh va » hang va, hanh vi
va cham » va chat, va tham
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
hieu va » lieu va, hieu qua

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 tu ((nang xa) or (lang xa)) hoi. hieu va cham duc va ((hanh van) or (hanh va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu ((nang xa) OR (lang xa)) hoi. hieu va cham duc va ((hanh van) OR (hanh va)) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach tu ((nang xa) or (lang xa)) hoi. hieu va cham duc va ((hanh van) or (hanh va)) cau tren*.