Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thinh le » trinh ly
nang ma » tang ma, sang ma, nang cao
ve chim » va chim, ve cham, ve chinh
vu cham » va cham, vu kham, tu cham
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
le cua » ly cua

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 y nang ma hoi. hieu ((ve chim) or (vu cham)) ((luc van) OR (duc van)) thinh le cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ma hoi. hieu ((ve chim) OR (vu cham)) ((luc van) OR (duc van)) thinh le cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ma hoi. hieu ((ve chim) or (vu cham)) ((luc van) OR (duc van)) thinh le cua vat".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ma hoi. hieu ((ve chim) or (vu cham)) ((luc van) OR (duc van)) thinh le cua vat*.