Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
hanh hai » thanh hai, nhanh hai, hang hai
tu sach » thu sach, te sach, tu cach
hai cua » thai cua, dai cua, hoi cua
su sach » so sach, vu sach
hieu vu » hieu va, hieu ve, dieu vu
va hanh » van hanh, va thanh, va danh
hieu su » hieu sau, tieu su, hieu so
tuc va » thuc va, truc va, tuc xa
cua tu » cua tuc, cua su, cua cu
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: ((tu sach) or (su sach)) ky nang x hoi. ((hieu vu) OR (hieu su)) cham tuc va hanh hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x hoi. ((hieu vu) OR (hieu su)) cham tuc va hanh hai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang x hoi. ((hieu vu) OR (hieu su)) cham tuc va hanh hai cua tu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x hoi. ((hieu vu) OR (hieu su)) cham tuc va hanh hai cua tu*.