Perhaps you should try some spelling variations:
kham truc » nham thuc, pham thuc, kham trai
te sach » toc sach
dau cua » dai cua, day cua, cau cua
dau cuu » dau cuoi
truc va » thuc va, thuc vat, trung va
va kham » va cham, va khao, va tham
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va dan » ca dan, va dao, va dau
ma hoi » mai hoi, xa hoi, me hoi

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 nang ((ma hoi) or (ma hoa)). hieu va kham truc va dan ((dau cuu) OR (dau cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((ma hoi) OR (ma hoa)). hieu va kham truc va dan ((dau cuu) OR (dau cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((ma hoi) or (ma hoa)). hieu va kham truc va dan ((dau cuu) OR (dau cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((ma hoi) or (ma hoa)). hieu va kham truc va dan ((dau cuu) OR (dau cua)) tre*.