Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
su triet » su viet, su tien, ve triet
lang hoa » hang hoa, lang ha, nang hoa
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu va » hieu qua
sach ky » sac ky, sach y, sach ty
thu vat » thu va, thuat vat, thu nhat
ky lang » ky nang, ky dang, ky tang
hanh ve » hanh vi, hanh va, hanh kem
ve su » va su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky lang hoa hoi. ((hieu va) or (lieu va)) nam ((thu vat) or (thuc vat)) hanh ve su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang hoa hoi. ((hieu va) OR (lieu va)) nam ((thu vat) OR (thuc vat)) hanh ve su triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang hoa hoi. ((hieu va) or (lieu va)) nam ((thu vat) or (thuc vat)) hanh ve su triet*.