Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua dieu
phan lap » phan dau
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
thi van » thi lan, thi hanh, thi nang
van bac » van ban, van bao, van hac
va phan » van phan, va phat, va phap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((nang xa) OR (lang xa)) hoi. thi van bac duc va phan lap ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang xa) OR (lang xa)) hoi. thi van bac duc va phan lap ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang xa) OR (lang xa)) hoi. thi van bac duc va phan lap ((cua viet) or (cua vat))".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang xa) OR (lang xa)) hoi. thi van bac duc va phan lap ((cua viet) or (cua vat))*.