Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
hieu ve » hieu va
sach tu » sach thu, cach tu, sach ty
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
nang ma » tang ma, sang ma, nang cao
tu nang » tru nang, tu nong, tu nano
dao cua » dai cua, dan cua, do cua
day cua » dai cua
ma hoi » mai hoi, xa hoi, ma hoa

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 tu nang ma hoi. ((hieu ve) or (hieu van)) cac xuc van hanh ((dao cua) OR (day cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu nang ma hoi. ((hieu ve) OR (hieu van)) cac xuc van hanh ((dao cua) OR (day cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu nang ma hoi. ((hieu ve) or (hieu van)) cac xuc van hanh ((dao cua) OR (day cua)) tu".
• Adding a wildcard symbol may retrieve word variants: toc sach tu nang ma hoi. ((hieu ve) or (hieu van)) cac xuc van hanh ((dao cua) OR (day cua)) tu*.