Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thuc xay » thuc day, tuc xay, thuat xay
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu su » hieu sau, tieu su, hieu so
su pham » san pham
xay han » xay chen, bay than, cay than
han tai » hang tai, nhan tai, van tai
tai cua » thai cua, tai cuc, tri cua
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 thuc xay han 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 thuc xay han tai cua tu.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang xa hoi. hieu su pham thuc xay han tai cua tu*.