Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
hieu viec » nhieu viec, hieu ve, sieu viet
cam thuc » am thuc, nam thuc, cam thu
va trinh » van trinh, va tinh, lap trinh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
thuc va » thuc vat, thuc dan, thuc day
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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 ky nang ma hoi. ((hieu viec) or (tieng viet)) cam thuc va trinh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. ((hieu viec) OR (tieng viet)) cam thuc va trinh van cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. ((hieu viec) or (tieng viet)) cam thuc va trinh van cua tre*.