Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thu sach » thuat sach, thuoc sach, thu hoach
hanh tai » thanh tai, hang tai, han tai
tu sach » te sach, tu cach, vu sach
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
thuc xa » thuc xay, tuc xa, thuc va
xa hanh » xa thanh, xa khanh, va hanh
cuc tu » cuc du, luc tu, duc tu

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 sach))) or (su sach)) ky nang xa hoi. hieu su pham thuc xa hanh tai cuc tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (thu sach))) OR (su sach)) ky nang xa hoi. hieu su pham thuc xa hanh tai cuc tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (thu sach))) or (su sach)) ky nang xa hoi. hieu su pham thuc xa hanh tai cuc tu".
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) OR (thu sach))) or (su sach)) ky nang xa hoi. hieu su pham thuc xa hanh tai cuc tu*.