Perhaps you should try some spelling variations:
tai khoa » da khoa, noi khoa
te sach » toc sach
hang di » hang doi, hang vi, hang dien
luu van » cuu van, luan van, luu hanh
xuc van » duc van, luc van, vuc van
cua tuc » cua duc, cua tu, cua thuoc
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
di cua » dai cua, doi cua, de cua
ve cac » va cac, vien cac

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 v nang ((mai hoi) or (tai khoa)). hieu ve cac ((xuc van) or (luu van)) hang di cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang ((mai hoi) OR (tai khoa)). hieu ve cac ((xuc van) OR (luu van)) hang di cua tuc.
• Adding a wildcard symbol may retrieve word variants: te sach v nang ((mai hoi) or (tai khoa)). hieu ve cac ((xuc van) or (luu van)) hang di cua tuc*.