Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cham cuu » cap cuu, chat cua
cham luc » cham soc, nhan luc, chat lua
nang xa » nang x, lang xa, nang ma
te sach » toc sach
hieu vu » hieu va, hieu ve, hieu su
dau cua » dai cua, day cua, cau cua
cua cua » cua chua, ca cua, qua cua
tu sach » thu sach, su sach, tu cach
y nang » ky nang, ly nang, v nang
va dau » va dao

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 (te sach)) y nang xa hoi. hieu vu ((cham luc) OR (cham cuu)) va dau cua cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang xa hoi. hieu vu ((cham luc) OR (cham cuu)) va dau cua cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) y nang xa hoi. hieu vu ((cham luc) OR (cham cuu)) va dau cua cua viet*".