Perhaps you should try some spelling variations:
cham trung » pham trung, pham truong, nam trung
trung va » truong va, trang va, trung ha
su sach » so sach, vu sach
doi cua » dai cua, hoi cua
va hang » van hang, va nang, va lang
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
ly nang » ky nang, ly hang, ly vang
y nang » ky nang, v nang, may nang
di cua » dai cua, de cua, do cua
x hoi » xa hoi, o hoi, x ho

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