Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach vuc » sach duoc, sach nuoc, sach truc
van hanh » van thanh, ban hanh, van anh
vuc nang » cuc nang, vu nang, chuc nang
xuc van » duc van, luc van, vuc van
nang ma » tang ma, sang ma, nang cao
kien su » tien su, vien sau, bien sua
va cam » va cham, va cac, va cao
ma hoi » mai hoi, xa hoi, ma hoa
va co » vo co

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach vuc nang ma hoi. hieu ((va cam) or (va co)) xuc van hanh ((kien su) OR (nien su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach vuc nang ma hoi. hieu ((va cam) OR (va co)) xuc van hanh ((kien su) OR (nien su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach vuc nang ma hoi. hieu ((va cam) or (va co)) xuc van hanh ((kien su) OR (nien su)) triet".
• Adding a wildcard symbol may retrieve word variants: thu sach vuc nang ma hoi. hieu ((va cam) or (va co)) xuc van hanh ((kien su) OR (nien su)) triet*.