Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
ve triet » va trien, su triet
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao

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