Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang tay » dang xay, dung tay, dan tay
thuc van » thuc vat, thuc dan, thuc va
tay hoi » tay ho, tao hoi, tay thai
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
tuc van » truc van, tuc va, duc van
cua te » cua tu
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: toc sach _ dang tay hoi. hieu ve cham ((tuc van) OR (thuc van)) hanh vi ((cua te) or (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach _ dang tay hoi. hieu ve cham ((tuc van) OR (thuc van)) hanh vi ((cua te) OR (cua cu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach _ dang tay hoi. hieu ve cham ((tuc van) OR (thuc van)) hanh vi ((cua te) or (cua cu))".
• Adding a wildcard symbol may retrieve word variants: toc sach _ dang tay hoi. hieu ve cham ((tuc van) OR (thuc van)) hanh vi ((cua te) or (cua cu))*.