Perhaps you should try some spelling variations:
khanh dai » thanh dat, khanh van, phan dai
hieu van » hieu va, thien van, lieu va
cua viet » hoa viet, cua vat, cua dieu
thu sach » thuat sach, thuoc sach, thu hoach
xa khanh » xa thanh, van khanh, dat khanh
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
ca viet » va viet, co viet, hoa viet
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) or (thu sach)) ky nang ma hoi. hieu van cam tuc xa khanh dai ((cua viet) OR (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ma hoi. hieu van cam tuc xa khanh dai ((cua viet) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang ma hoi. hieu van cam tuc xa khanh dai ((cua viet) OR (ca viet))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ma hoi. hieu van cam tuc xa khanh dai ((cua viet) OR (ca viet))*.