Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
loai hoc » logic hoc, loai khoa, dai hoc
tu sach » thu sach, su sach, te sach
su chao » su cao, sau chan
vai cua » dai cua, hai cua, lai cua
hieu su » hieu sau, tieu su, hieu so
sach ky » sac ky, sach y, sach ty
lai hoa » dai hoa
ky sang » ky nang, ky dang, ky tang
xu van » tu van, su van
vu van » tu van
cua cu » cua chu, cua cau, cua su

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 ky sang ((lai hoa) or (loai hoc)). hieu su chao ((xu van) OR (vu van)) hanh vai cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ((lai hoa) OR (loai hoc)). hieu su chao ((xu van) OR (vu van)) hanh vai cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang ((lai hoa) or (loai hoc)). hieu su chao ((xu van) OR (vu van)) hanh vai cua cu".
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ((lai hoa) or (loai hoc)). hieu su chao ((xu van) OR (vu van)) hanh vai cua cu*.