Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
sach ly » sach y, sach lo, sach ty
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu van
ly nang » ky nang, ly hang, ly vang
lua tre » cua tre, luy tre, dua tren
xuc va » duc va, tuc va, luc va
dan vi » doan vi, don vi, gan vi
dan va » doan va, dan ca, ban va

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 ho. ((hieu ve) or (hieu va)) cac xuc va ((dan vi) OR (dan va)) lua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang x ho. ((hieu ve) OR (hieu va)) cac xuc va ((dan vi) OR (dan va)) lua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang x ho. ((hieu ve) or (hieu va)) cac xuc va ((dan vi) OR (dan va)) lua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang x ho. ((hieu ve) or (hieu va)) cac xuc va ((dan vi) OR (dan va)) lua tre*.