Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
lang hoa » hang hoa, lang ha, nang hoa
hieu van » hieu va, thien van, lieu va
toc sac » toc sach, toc san, hoc sach
duc van » duc va, duc tan, duc manh
duc ban » duc tan, dua ban, duc man
van cam » van nam, van lam, van cau
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky lang hoa hoi. hieu van cam ((duc ban) OR (duc van)) thanh vi ((cua te) or (qua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky lang hoa hoi. hieu van cam ((duc ban) OR (duc van)) thanh vi ((cua te) OR (qua su))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky lang hoa hoi. hieu van cam ((duc ban) OR (duc van)) thanh vi ((cua te) or (qua su))*".