Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh de » hanh ve, hanh kem
va cham » va chat, va tham
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
soc va » loc va, doc va, goc va
de cua » le cua, te cua, dieu 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: ((te sach) or (toc sach)) ty nang xa hoi. hieu va cham ((soc va) OR (hoc va)) hanh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang xa hoi. hieu va cham ((soc va) OR (hoc va)) hanh de cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ty nang xa hoi. hieu va cham ((soc va) OR (hoc va)) hanh de cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty nang xa hoi. hieu va cham ((soc va) OR (hoc va)) hanh de cua te*.