Perhaps you should try some spelling variations:
sang tai » hang tai, sang tao, tang tai
tai khoa » da khoa, noi khoa
te sach » toc sach
duc van » duc va, duc tan, duc manh
tai cua » thai cua, tai cuc, tri cua
tai cuu » tai cuc, tai buu, thai cua
luc van » luoc van, luu van, luc va
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky sang tai khoa. hieu ve cam ((luc van) or (duc van)) hang ((tai cuu) OR (tai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky sang tai khoa. hieu ve cam ((luc van) OR (duc van)) hang ((tai cuu) OR (tai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky sang tai khoa. hieu ve cam ((luc van) or (duc van)) hang ((tai cuu) OR (tai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky sang tai khoa. hieu ve cam ((luc van) or (duc van)) hang ((tai cuu) OR (tai cua)) tre*.