Perhaps you should try some spelling variations:
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cai hoa » cau hoa, cam hoa, dai hoa
cai hoi » cau hoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa

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 ky nang ((cai hoi) or (cai hoa)). hieu ve cam tuc va hanh ((hai cua) or (hoi chuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((cai hoi) OR (cai hoa)). hieu ve cam tuc va hanh ((hai cua) OR (hoi chuc)) tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((cai hoi) or (cai hoa)). hieu ve cam tuc va hanh ((hai cua) or (hoi chuc)) tre*.