Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuoc sinh
thuat sach » thuat lanh, thuat san
vien cua » viec cua, dien cua, tien cua
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va nhan » van nhan, ca nhan, va phan
luc va » duc va, tuc va, loc va
ve cao » ve bao, ve cac, ve co
va cao » va cac, va co, va dao
cua te » cua tu

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

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