Perhaps you should try some spelling variations:
dau triet » cau triet, dau tien, su triet
viec khoa » vien khoa, viec khong, lieu khoa
viec cho » viec nhom, viec cua, viec so
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, mang xa
xuc cam » phuc cam
cam dan » cac dan, ca dan, nam dan
su sach » so sach, vu sach
dan va » doan va, dan ca, ban va
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: su sach ky ((nang xa) OR (nang ma)) hoi. hieu ((viec cho) or (viec khoa)) xuc cam dan va dau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (nang ma)) hoi. hieu ((viec cho) OR (viec khoa)) xuc cam dan va dau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) OR (nang ma)) hoi. hieu ((viec cho) or (viec khoa)) xuc cam dan va dau triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) OR (nang ma)) hoi. hieu ((viec cho) or (viec khoa)) xuc cam dan va dau triet*.