Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cua viet » ca viet, hoa viet, cua vat
lap cua » lai cua, tap cua, lam cua
va phan » van phan, va phap, hoa phan
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu vu » hieu va, hieu su, dieu vu
nang ho » nang hoc, nang co, tang ho
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
ho hoi » hoc hoi, hoa hoi, hoi hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang ho hoi. ((hieu vu) or (hieu ve)) nham thuc ((va phan) OR (va phat)) lap cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ho hoi. ((hieu vu) OR (hieu ve)) nham thuc ((va phan) OR (va phat)) lap cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ho hoi. ((hieu vu) or (hieu ve)) nham thuc ((va phan) OR (va phat)) lap cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ho hoi. ((hieu vu) or (hieu ve)) nham thuc ((va phan) OR (va phat)) lap cua viet*.