Perhaps you should try some spelling variations:
cham trung » pham trung, pham truong, nam trung
trung va » truong va, trang va, trung ha
nang doi » nang doc, nang noi, hang doi
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va nang » van nang, da nang, cam nang
doi cua » dai cua, hoi cua
y nang » ky nang, ly nang, v nang
mo hoc » mon hoc, co hoc
cua te » cua tu
o hoc » co hoc, so hoc, y hoc

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 ((o hoc) OR (mo hoc)). hieu ve cham trung va nang doi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((o hoc) OR (mo hoc)). hieu ve cham trung va nang doi cua te".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((o hoc) OR (mo hoc)). hieu ve cham trung va nang doi cua te*.