Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
thuc day » thuc dan, thuc vat
tu sach » thu sach, te sach, tu cach
tai cua » thai cua, tai cuc, tri cua
su pham » san pham
hieu su » hieu sau, tieu su, hieu so
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
cua tu » cua tuc, cua su, cua cu

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 (su sach)) ky nang xa hoi. hieu su pham ((thuat xay) or (thuc day)) hanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. hieu su pham ((thuat xay) OR (thuc day)) hanh tai cua tu.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang xa hoi. hieu su pham ((thuat xay) or (thuc day)) hanh tai cua tu*.