Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, nuoc sach
vu nang » vuc nang, va nang, vu dang
nang xa » nang x, lang xa, nang ma
cam loc » cam lo
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
loc va » hoc va, luc va

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) or (thuoc sach)) vu nang xa hoi. hieu va cam loc va hanh kem ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) vu nang xa hoi. hieu va cam loc va hanh kem ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (thuoc sach)) vu nang xa hoi. hieu va cam loc va hanh kem ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuoc sach)) vu nang xa hoi. hieu va cam loc va hanh kem ((cua tre) OR (cua triet))*.