Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cau thuc » cuu thuc, can thuc, cau phuc
dan hanh » dang hanh, dan khanh, dan thanh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hanh le » thanh le, hanh ve, hanh de
le cua » ly cua
cua te » cua tu

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 ky nang xa hoi. hieu van ((cau thuc) or (cau truc)) dan hanh le cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu van ((cau thuc) OR (cau truc)) dan hanh le cua te.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu van ((cau thuc) or (cau truc)) dan hanh le cua te*.