Perhaps you should try some spelling variations:
chat trung » chat trong, ha trung, cua trung
toc sach » hoc sach, doc sach, thuoc sach
tinh hai » tinh thai, tinh chat, trinh han
tinh dai » trinh dai, tinh da, tinh doi
trung va » truong va, trang va, trung ha
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
me hoi » le hoi
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang ((me hoi) or (mai hoi)). hieu va chat trung va ((tinh dai) OR (tinh hai)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ((me hoi) OR (mai hoi)). hieu va chat trung va ((tinh dai) OR (tinh hai)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ((me hoi) or (mai hoi)). hieu va chat trung va ((tinh dai) OR (tinh hai)) cua tu".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((me hoi) or (mai hoi)). hieu va chat trung va ((tinh dai) OR (tinh hai)) cua tu*.