Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
hanh tai » thanh tai, han tai, hinh tai
hang tai » hang va, dung tai
nang xa » nang x, lang xa, nang ma
nam duc » nam duoc, pham duc, nam thuc
va nam » van nam, ha nam, va nay
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: ((toc sach) or (hoc sach)) ky nang xa hoi. lieu va nam duc va ((hanh tai) OR (hang tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ky nang xa hoi. lieu va nam duc va ((hanh tai) OR (hang tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (hoc sach)) ky nang xa hoi. lieu va nam duc va ((hanh tai) OR (hang tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) ky nang xa hoi. lieu va nam duc va ((hanh tai) OR (hang tai)) cua te*.