Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
nganh xay » nganh mac, nganh y, nganh ma
vien canh » bien canh, vien can, vien nganh
canh thuc » anh thuc, cach thuc, danh thuc
trinh van » trinh han, trinh quan, trinh toan
nang xay » dang xay, nang xuan, nang cao
va trinh » van trinh, va tinh, lap trinh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
van phu » san phu, van phung, van phan
phu tre » phu tran, phu troi, thuc tre

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 xay) or (nganh xay)) hoi. hieu vien canh thuc va trinh van phu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xay) OR (nganh xay)) hoi. hieu vien canh thuc va trinh van phu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xay) or (nganh xay)) hoi. hieu vien canh thuc va trinh van phu tre*.