Perhaps you should try some spelling variations:
trinh cuu » trinh cau, trinh cua, trinh chu
tham loc » tham nuoc, cham soc, hau loc
toc sach » hoc sach, doc sach, thuoc sach
van dinh » van minh, van dich, va dinh
loc van » luoc van, hoc van, lo van
tri cuu » tri cua, tra cuu, troi cua
va tham » van tham, va cham, va thanh
sang ma » tang ma, nang ma, sang tao
ma hoi » mai hoi, xa hoi, ma hoa
y sang » _ sang, duy sang

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) or (toc sach)) y sang ma hoi. lieu va tham loc van dinh ((tri cuu) OR (trinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y sang ma hoi. lieu va tham loc van dinh ((tri cuu) OR (trinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) y sang ma hoi. lieu va tham loc van dinh ((tri cuu) OR (trinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) y sang ma hoi. lieu va tham loc van dinh ((tri cuu) OR (trinh cuu)) tre*.