Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
sach thu » sach thue, sach thieu, sach tham
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, xach tay
lam luc » lao luc, lam duoc
va lam » van lam, va lap
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ty) OR (sach thu)) lang xa hoi. hieu va lam luc va ((hanh vi) or (thanh va)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach thu)) lang xa hoi. hieu va lam luc va ((hanh vi) OR (thanh va)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) OR (sach thu)) lang xa hoi. hieu va lam luc va ((hanh vi) or (thanh va)) cua tu".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) OR (sach thu)) lang xa hoi. hieu va lam luc va ((hanh vi) or (thanh va)) cua tu*.