Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
cua viet » ca viet, hoa viet, cua vat
phan lap » phan dau
hoc hoi » hoc khoi, hoc hoa, hoc noi
sach ty » sach y, sach tu, sach thu
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
truc va » thuc va, thuc vat, trung va
va phan » van phan, va phat, va phap
ty nang » ky nang, ty xang, ty hang
lap cua » lai cua, tap cua, lam cua
tu sach » thu sach, su sach, te sach
ho hoi » hoa hoi, hoi hoi, co hoi

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 ty nang ((ho hoi) or (hoc hoi)). hieu vu cham truc va phan lap cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((ho hoi) OR (hoc hoi)). hieu vu cham truc va phan lap cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((ho hoi) or (hoc hoi)). hieu vu cham truc va phan lap cua viet*.