Perhaps you should try some spelling variations:
cham trung » pham trung, pham truong, nam trung
so sach » so sanh, bo sach, co sach
doi cua » dai cua, hoi cua
va lang » va nang, hoa lang
va hang » van hang, va nang, va hanh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
di cua » dai cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang xa hoi. hieu ve cham trung ((va hang) or (va lang)) ((di cua) OR (doi cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang xa hoi. hieu ve cham trung ((va hang) OR (va lang)) ((di cua) OR (doi cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang xa hoi. hieu ve cham trung ((va hang) or (va lang)) ((di cua) OR (doi cua)) te".
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. hieu ve cham trung ((va hang) or (va lang)) ((di cua) OR (doi cua)) te*.