Perhaps you should try some spelling variations:
ve triet » va trien, su triet
sach vuc » sach duoc, sach nuoc, sach truc
vuc nang » cuc nang, vu nang, chuc nang
luc van » luoc van, luu van, duc van
xuc van » duc van, vuc van, xuc ban
tu sach » thu sach, su sach, te sach
va cham » va chat, va tham
hieu va » lieu va, hieu qua
ma hoi » mai hoi, ma hoa, me hoi
kem ve » ke ve

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