Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
thuc dan » thuc hanh, hoc dan, thuc vat
dan hang » ban hang, van hang, dat hang
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
cua hoi » cua moi
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
va cua » va chua, via cua, ca cua

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 thi nang ((cua hoi) or (xa hoi)). hieu va pham thuc dan hang va cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi nang ((cua hoi) OR (xa hoi)). hieu va pham thuc dan hang va cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach thi nang ((cua hoi) or (xa hoi)). hieu va pham thuc dan hang va cua viet*.