Perhaps you should try some spelling variations:
chuc nganh » chuc nang, hoc nganh, cac nganh
hang viet » hoang viet, nang viet, mang viet
cau tren » cu tren, dau tren, ca tren
viet cau » viet chau, viet ca, viet chu
luc ngan » luc nganh, luc nhan, luat ngan
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
ve cau » ke cau, va cau, le cau
ve cac » va cac, vien cac

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 ty nang xa hoi. hieu ((ve cau) or (ve cac)) ((luc ngan) or (chuc nganh)) hang viet cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ((ve cau) OR (ve cac)) ((luc ngan) OR (chuc nganh)) hang viet cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ((ve cau) or (ve cac)) ((luc ngan) or (chuc nganh)) hang viet cau tren*.