Perhaps you should try some spelling variations:
vien cua » viec cua, dien cua, tien cua
cao truc » cau truc, vao truc, cao thuoc
thu sac » thu sach, thu san, thu xac
va nhan » van nhan, ca nhan, va nha
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
va phan » van phan, va phat, va phap
hieu ve » hieu va, hieu van
ve cao » va cao, ve bao, ve cac
sac ky » cac ky, sai ky
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky ((nang xa) or (nang ma)) hoi. hieu ve cao truc ((va nhan) OR (va phan)) vien cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky ((nang xa) OR (nang ma)) hoi. hieu ve cao truc ((va nhan) OR (va phan)) vien cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky ((nang xa) or (nang ma)) hoi. hieu ve cao truc ((va nhan) OR (va phan)) vien cua tu".
• Adding a wildcard symbol may retrieve word variants: thu sac ky ((nang xa) or (nang ma)) hoi. hieu ve cao truc ((va nhan) OR (va phan)) vien cua tu*.