Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
ky sang » ky nang, ky dang, ky tang
sang xa » song xa, lang xa, sang ma
dam tuc » dam thuc, dao tuc, nam thuc
dan tai » van tai, dan thi, han tai
cuc tre » duc tre, cua tre, cuu tre
dam tu » nam tu, cam tu, tam tu
va dan » ca dan, va dao, va dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu hoach)) ky sang xa hoi. hieu van ((dam tuc) or (dam tu)) va dan tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky sang xa hoi. hieu van ((dam tuc) OR (dam tu)) va dan tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky sang xa hoi. hieu van ((dam tuc) or (dam tu)) va dan tai cuc tre*.